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Stock-Based Compensation (Tables)
9 Months Ended
Sep. 30, 2020
Stock-Based Compensation Expense Stock-based compensation expense was as follows (in thousands):
     Three Months Ended
September 30,
     Nine Months Ended
September 30,
 
     2020      2019      2020      2019  
Cost of revenues
   $ 296    $ 86    $ 692    $ 228
Selling, general and administrative
     846      482      2,313      1,507
Research and development
     498      185      1,281      557
  
 
 
    
 
 
    
 
 
    
 
 
 
Total stock-based compensation
   $ 1,640    $ 753    $ 4,286    $ 2,292
  
 
 
    
 
 
    
 
 
    
 
 
 
Summary of Compensation Expense by Type of Award
Compensation expense by type of award was as follows (in thousands):
 
     Three Months Ended
September 30,
     Nine Months Ended
September 30,
 
     2020      2019      2020      2019  
Stock options
   $ 1,420    $ 514    $ 3,663    $ 1,556
ESPP
     220      239      623      736
  
 
 
    
 
 
    
 
 
    
 
 
 
Total stock-based compensation
   $ 1,640    $ 753    $ 4,286    $ 2,292